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SECTION IB-1G-500
INSTALLATION & OPERATION INSTRUCTIONS
PAD-MOUNTED SWITCHGEAR TYPE PSI
REV. 1.6 - NOVEMBER 2017
PAGE 8
Auto-Jet
Load-break Fuse
®
The Auto-jet
fuse mounting has a stored energy load-break
®
device that permits single-pole live switching in single phase or
three phase circuits by the use of an ordinary hotstick. The de-
vice has a 3-time fault close duty-cycle when the fuse is closed
briskly without hesitation. The overall unit rating may be limited
by the fuse rating.
The same unique laminated air jet interrupter system used in the
3-pole group operated switches is applied in the Auto-jet
break fuse mountings.
Illustration of Auto-Jet
1. Closed: Hookstick Ready To Open
2. Main contacts Have Parted, Puffer Spring Charged, and Interrupter
Parted
3. Holder Parted, Auto-jet
Reset For Next Operation
®
601 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 669-1869 • www.federalpacific.com • ISO9001:2015
load-
®
Fuse Interrupter
®
Load-break Fuse Operation
1. Open appropriate fuse compartment door and secure.
2. Remove optional B4/B5 inner door barrier, if applicable.
Remove optional B2 fuse dual purpose barrier, if applicable,
permitting access to desired fuse. The dual purpose barrier
may be removed using hotstick and grappler tool arrange-
ments. See Figure 16.
3. Install grappler tool as shown.
4. Pull the fuse open with one brisk continuous motion to fully
open position (45°). Maintain downward force on fuse until
fuse opening motion has ceased to prevent tendency for
fuse to bounce toward the closed position. See Figure 17.
Do not assume that an open fuse position indicates the fuse to
be de-energized.
5. Reinstall grappler onto fuse assembly and while grasping
hotstick firmly, lift fuse assembly up and out of mounting.
See Figure 18.
6. If optional dual-purpose barriers are supplied, use grappler
to install into slide-in position to provide barrier between
Auto-jet
fuse interrupter and fuse bottom hinge. See
®
Figure 19.
Do not attempt to close main door unless open fuse has been
removed from unit.
7. Re-fuse using the procedures included with the replace-
ment fuse unit.
8. Remove optional dual purpose barriers, if supplied, using
grappler. See Figure 19.
9. Reinstall grappler onto fuse assembly and place fuse
assembly into fuse mounting in the 45° open (disconnect)
position. See Figure 18.
10. Insert grappler prong into fuse pull ring and push up briskly
on the fuse assembly, completing the closing stroke in one
motion. See Figure 17.
11. Before removing grappler from fuse pull ring, push firmly to
assure that the fuse is completely closed and latched.
12. Use grappler to return optional dual purpose barrier, if
furnished, to the normal, hanging position. See Figure 16.
13. Close the main door and padlock before leaving gear.
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